i386/linux/linux-2.3.21/include/asm-m68k/page.h

   1 #ifndef _M68K_PAGE_H
   2 #define _M68K_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #ifndef CONFIG_SUN3
   8 #define PAGE_SHIFT      (12)
   9 #define PAGE_SIZE       (4096)
  10 #else
  11 #define PAGE_SHIFT      (13)
  12 #define PAGE_SIZE       (8192)
  13 #endif
  14 #define PAGE_MASK       (~(PAGE_SIZE-1))
  15
  16 #ifdef __KERNEL__
  17
  18 #include <asm/setup.h>
  19
  20 #if PAGE_SHIFT < 13
  21 #define KTHREAD_SIZE (8192)
  22 #else
  23 #define KTHREAD_SIZE PAGE_SIZE
  24 #endif
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #define STRICT_MM_TYPECHECKS
  29
  30 #define get_user_page(vaddr)    __get_free_page(GFP_KERNEL)
  31 #define free_user_page(page, addr)      free_page(addr)
  32
  33 /*
  34  * We don't need to check for alignment etc.
  35  */
  36 #ifdef CPU_M68040_OR_M68060_ONLY
  37 static inline void copy_page(unsigned long to, unsigned long from)
  38 {
  39   unsigned long tmp;
  40
  41   __asm__ __volatile__("1:\t"
  42                        ".chip 68040\n\t"
  43                        "move16 %1@+,%0@+\n\t"
  44                        "move16 %1@+,%0@+\n\t"
  45                        ".chip 68k\n\t"
  46                        "dbra  %2,1b\n\t"
  47                        : "=a" (to), "=a" (from), "=d" (tmp)
  48                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  49                        );
  50 }
  51
  52 static inline void clear_page(unsigned long page)
  53 {
  54         unsigned long data, sp, tmp;
  55
  56         sp = page;
  57
  58         data = 0;
  59
  60         *((unsigned long *)(page))++ = 0;
  61         *((unsigned long *)(page))++ = 0;
  62         *((unsigned long *)(page))++ = 0;
  63         *((unsigned long *)(page))++ = 0;
  64
  65         __asm__ __volatile__("1:\t"
  66                              ".chip 68040\n\t"
  67                              "move16 %2@+,%0@+\n\t"
  68                              ".chip 68k\n\t"
  69                              "subqw  #8,%2\n\t"
  70                              "subqw  #8,%2\n\t"
  71                              "dbra   %1,1b\n\t"
  72                              : "=a" (page), "=d" (tmp)
  73                              : "a" (sp), "0" (page),
  74                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  75 }
  76
  77 #else
  78 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  79 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  80 #endif
  81
  82 #ifdef STRICT_MM_TYPECHECKS
  83 /*
  84  * These are used to make use of C type-checking..
  85  */
  86 typedef struct { unsigned long pte; } pte_t;
  87 typedef struct { unsigned long pmd[16]; } pmd_t;
  88 typedef struct { unsigned long pgd; } pgd_t;
  89 typedef struct { unsigned long pgprot; } pgprot_t;
  90
  91 #define pte_val(x)      ((x).pte)
  92 #define pmd_val(x)      ((&x)->pmd[0])
  93 #define pgd_val(x)      ((x).pgd)
  94 #define pgprot_val(x)   ((x).pgprot)
  95
  96 #define __pte(x)        ((pte_t) { (x) } )
  97 #define __pmd(x)        ((pmd_t) { (x) } )
  98 #define __pgd(x)        ((pgd_t) { (x) } )
  99 #define __pgprot(x)     ((pgprot_t) { (x) } )
 100
 101 #else
 102 /*
 103  * .. while these make it easier on the compiler
 104  */
 105 typedef unsigned long pte_t;
 106 typedef struct { unsigned long pmd[16]; } pmd_t;
 107 typedef unsigned long pgd_t;
 108 typedef unsigned long pgprot_t;
 109
 110 #define pte_val(x)      (x)
 111 #define pmd_val(x)      ((&x)->pmd[0])
 112 #define pgd_val(x)      (x)
 113 #define pgprot_val(x)   (x)
 114
 115 #define __pte(x)        (x)
 116 #define __pmd(x)        ((pmd_t) { (x) } )
 117 #define __pgd(x)        (x)
 118 #define __pgprot(x)     (x)
 119
 120 #endif
 121
 122 /* to align the pointer to the (next) page boundary */
 123 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 124
 125 /* This handles the memory map.. */
 126 #ifndef CONFIG_SUN3
 127 #define PAGE_OFFSET             0
 128 #else
 129 #define PAGE_OFFSET             0x0E000000
 130 #endif
 131
 132 #ifndef CONFIG_SUN3
 133 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 134 /*
 135  * A hacky workaround for the problems with mmap() of frame buffer
 136  * memory in the lower 16MB physical memoryspace.
 137  *
 138  * This is a short term solution, we will have to deal properly
 139  * with this in 2.3.x.
 140  */
 141 extern inline void *__va(unsigned long physaddr)
 142 {
 143 #ifdef CONFIG_AMIGA
 144         if (MACH_IS_AMIGA && (physaddr < 16*1024*1024))
 145                 return (void *)0xffffffff;
 146         else
 147 #endif
 148                 return (void *)(physaddr+PAGE_OFFSET);
 149 }
 150 #else   /* !CONFIG_SUN3 */
 151 /* This #define is a horrible hack to suppress lots of warnings. --m */
 152 #define __pa(x) ___pa((unsigned long)x)
 153 static inline unsigned long ___pa(unsigned long x)
 154 {
 155      if(x == 0)
 156           return 0;
 157      if(x > PAGE_OFFSET)
 158         return (x-PAGE_OFFSET);
 159      else
 160         return (x+0x2000000);
 161 }
 162
 163 static inline void *__va(unsigned long x)
 164 {
 165      if(x == 0)
 166           return (void *)0;
 167
 168      if(x < 0x2000000)
 169         return (void *)(x+PAGE_OFFSET);
 170      else
 171         return (void *)(x-0x2000000);
 172 }
 173 #endif  /* CONFIG_SUN3 */
 174
 175 #define MAP_NR(addr)            (__pa(addr) >> PAGE_SHIFT)
 176
 177 #endif /* !__ASSEMBLY__ */
 178
 179 #ifndef CONFIG_SUN3
 180 #define BUG() do { \
 181         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
 182         asm volatile("illegal"); \
 183 } while (0)
 184 #else
 185 #define BUG() do { \
 186         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
 187         panic("BUG!"); \
 188 } while (0)
 189 #endif
 190
 191 #define PAGE_BUG(page) do { \
 192         BUG(); \
 193 } while (0)
 194
 195 #endif /* __KERNEL__ */
 196
 197 #endif /* _M68K_PAGE_H */